Display screen or portion thereof with an animated computer generated falling dialog



FIG. 1 is the first image in a sequence for a display screen with an animated computer generated falling dialog showing the new design.

FIG. 2 is the second image thereof;

FIG. 3 is the third image thereof;

FIG. 4 is the fourth image thereof;

FIG. 5 is the fifth image thereof;

FIG. 6 is the sixth image thereof;

FIG. 7 is the seventh image thereof;

FIG. 8 is the eighth image thereof;

FIG. 9 is the ninth image thereof;

FIG. 10 is the tenth image thereof;

FIG. 11 is the eleventh image thereof; and,

FIG. 12 is the twelfth image thereof.

The appearance of the animated computer generated falling dialog sequentially transitions between the images shown in FIGS. 1-12. The process or period in which one image transitions to another forms no part of the claimed design.

The broken line showing of a display screen or portion thereof, text and other elements are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with an animated computer generated falling dialog, as shown and described. 